feat(indexer): Allow mechanism to not index tag values

[nikhars]

This PR adds mechanism to skip indexing tag values. The code is based on an option introduced in https://github.com/getsentry/sentry/pull/38758/

After the change, when the option is configured, the indexer on performance would send strings for tag values

[nikhars]

this looks fine to me but idk what the plan wrt the protocol change is. i think it would be easier to review both prs at the same time, not sequentially

The Snuba PR is here https://github.com/getsentry/snuba/pull/3146